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It will be no problem to open up the combustion chamber of a Mk II GT6 cyl
head. Jim Gray is right that measuring the volume of the chambers is all
important. You need to measure, with a seringue, the volume of all the
chambers, because the volumes can differ a lot, and determine at what
volume you want to arrive to get the compression ratio you want. If the
deck height is zero, a 1mm gasket is ok to get a strong squish. A 1mm gasket
is 4.2cc when the bore is the standard 74.7mm.
Marcel
_____
Van: Fot [mailto:fot-bounces@autox.team.net] Namens riverside@southslope.net
Verzonden: maandag 19 oktober 2015 20:31
Aan: Jim Gray; 'Spitfire Racing'; 'Fot'
Onderwerp: Re: [Fot] Head question on TR-6
cc the head so you know where you are.
an extra head gasket MAY have a negative impact
in your quench distance.
Sent: Sunday, October 18, 2015 2:37 PM
Subject: Re: [Fot] Head question on TR-6
Russ,
Yes you can adjust the volume that way but you can always go to a thicker
head gasket to get you there. You also have to know the deck height of the
block
it's going on.
jim g
_____
From: Fot [mailto:fot-bounces@autox.team.net] On Behalf Of Spitfire Racing
Sent: Sunday, October 18, 2015 7:33 AM
To: 'Fot'
Subject: [Fot] Head question on TR-6
For the past 20 years or so I have had a NOS Circle B 6 cylinder head on a
shelf in the parts room. For some reason I assumed it was for a TR-6 and
would be ideal as a starting point for an eventual TR-250 project. Must to
my disappointment I find it is a Mk2 GT-6 head. Likely it would afford too
high a CR sitting on a 2500cc engine in stock condition.
The question is... Is it unreasonable to think I can open up the combustion
chamber to bring the CR down to ~ 10.5:1 using it on a 2500cc application ?
Any of you have the combustion chamber volume to achieve this using flat top
pistons ??
Anyone out there have done this before? No point in trying to reinvent the
wheel. Serial number on head is 517528.
Snow on the ground this AM and temps in the 20s has me already in the winter
project mode!
Thanks,
Russ Moore
Spitfire #49
_____
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
http://autox.team.net/mailman/options/fot/riverside@southslope.net
_____
No virus found in this message.
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<DIV dir=3Dltr align=3Dleft><FONT color=3D#0000ff size=3D2 =
face=3DArial><SPAN=20
class=3D342440607-20102015>It will be no problem to open up the =
combustion chamber=20
of a Mk II GT6 cyl head. Jim Gray is right that measuring =
the volume=20
of the chambers is all important. You need to measure, with a =
seringue, the=20
volume of all the chambers, because the volumes can differ a lot, =
and=20
determine at what volume you want to arrive to get the =
compression=20
ratio you want. If the deck height is zero, a 1mm gasket is ok =
to get a strong squish. A 1mm gasket is 4.2cc when the =
bore is=20
the standard 74.7mm. </SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT color=3D#0000ff size=3D2 =
face=3DArial><SPAN=20
class=3D342440607-20102015>Marcel</SPAN></FONT></DIV><BR>
<DIV lang=3Dnl class=3DOutlookMessageHeader dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT size=3D2 face=3DTahoma><B>Van:</B> Fot =
[mailto:fot-bounces@autox.team.net]=20
<B>Namens </B>riverside@southslope.net<BR><B>Verzonden:</B> maandag 19 =
oktober=20
2015 20:31<BR><B>Aan:</B> Jim Gray; 'Spitfire Racing';=20
'Fot'<BR><B>Onderwerp:</B> Re: [Fot] Head question on =
TR-6<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>cc the head so you know where you are.</DIV>
<DIV> </DIV>
<DIV>an extra head gasket MAY have a negative impact </DIV>
<DIV>in your quench distance.</DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV style=3D"FONT: 10pt tahoma">
<DIV> </DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dtoodamnfunky@comcast.net=20
href=3D"mailto:toodamnfunky@comcast.net";>Jim Gray</A> </DIV>
<DIV><B>Sent:</B> Sunday, October 18, 2015 2:37 PM</DIV>
<DIV><B>To:</B> <A title=3DSpitfire_Racing@twcny.rr.com=20
href=3D"mailto:Spitfire_Racing@twcny.rr.com";>'Spitfire Racing'</A> ; <A=20
title=3Dfot@autox.team.net href=3D"mailto:fot@autox.team.net";>'Fot'</A> =
</DIV>
<DIV><B>Subject:</B> Re: [Fot] Head question on TR-6</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV class=3DSection1>
<P class=3DMsoNormal><FONT color=3Dnavy size=3D2 face=3DArial><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial; COLOR: =
navy">Russ,<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT color=3Dnavy size=3D2 face=3DArial><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial; COLOR: navy">Yes you can =
adjust the=20
volume that way but you can always go to a thicker head gasket to get =
you there.=20
You also have to know the deck height of the =
block<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT color=3Dnavy size=3D2 face=3DArial><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial; COLOR: navy">it’s =
going=20
on.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT color=3Dnavy size=3D2 face=3DArial><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial; COLOR: navy">jim=20
g<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT color=3Dnavy size=3D2 face=3DArial><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial; COLOR: =
navy"><o:p></o:p></SPAN></FONT> </P>
<DIV>
<DIV class=3DMsoNormal style=3D"TEXT-ALIGN: center" align=3Dcenter><FONT =
size=3D3=20
face=3D"Times New Roman"><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: "Times New Roman"'>
<HR tabIndex=3D-1 align=3Dcenter SIZE=3D2 width=3D"100%">
</SPAN></FONT></DIV>
<P class=3DMsoNormal><B><FONT size=3D2 face=3DTahoma><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: tahoma; FONT-WEIGHT: =
bold">From:</SPAN></FONT></B><FONT=20
size=3D2 face=3DTahoma><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
tahoma"> Fot=20
[mailto:fot-bounces@autox.team.net] <B><SPAN style=3D"FONT-WEIGHT: =
bold">On Behalf=20
Of </SPAN></B>Spitfire Racing<BR><B><SPAN=20
style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Sunday, October 18, 2015 =
7:33=20
AM<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B> =
'Fot'<BR><B><SPAN=20
style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> [Fot] Head question on=20
TR-6</SPAN></FONT><FONT size=3D3 face=3D"Times New Roman"><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: "Times New =
Roman"'><o:p></o:p></SPAN></FONT></P></DIV>
<P class=3DMsoNormal><FONT size=3D2 face=3DCalibri><SPAN=20
style=3D"FONT-SIZE: 11pt"><o:p></o:p></SPAN></FONT> </P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN =
style=3D"FONT-SIZE: 14pt">For=20
the past 20 years or so I have had a NOS Circle B 6 cylinder head on a =
shelf in=20
the parts room. For some reason I assumed it was for a TR-6 and would be =
ideal=20
as a starting point for an eventual TR-250 project. Must to my =
disappointment I=20
find it is a Mk2 GT-6 head. Likely it would afford too high a CR sitting =
on a=20
2500cc engine in stock condition. <o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN =
style=3D"FONT-SIZE: 14pt">The=20
question is……… Is it unreasonable to think I can open =
up the combustion chamber=20
to bring the CR down to ~ 10.5:1 using it on a 2500cc application=20
?<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN =
style=3D"FONT-SIZE: 14pt">Any=20
of you have the combustion chamber volume to achieve this using flat top =
pistons=20
??<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN=20
style=3D"FONT-SIZE: 14pt"><o:p></o:p></SPAN></FONT> </P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN=20
style=3D"FONT-SIZE: 14pt">Anyone out there have done this before? No =
point in=20
trying to reinvent the wheel. Serial number on head is=20
517528.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN =
style=3D"FONT-SIZE: 14pt">Snow=20
on the ground this AM and temps in the 20s has me already in the winter =
project=20
mode!<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN=20
style=3D"FONT-SIZE: 14pt"><o:p></o:p></SPAN></FONT> </P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN=20
style=3D"FONT-SIZE: 14pt">Thanks,<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN=20
style=3D"FONT-SIZE: 14pt"><o:p></o:p></SPAN></FONT> </P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN =
style=3D"FONT-SIZE: 14pt">Russ=20
Moore<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN=20
style=3D"FONT-SIZE: 14pt">Spitfire #49<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN=20
style=3D"FONT-SIZE: 14pt"><o:p></o:p></SPAN></FONT> </P>
<P class=3DMsoNormal><FONT size=3D4 face=3DCalibri><SPAN=20
style=3D"FONT-SIZE: 14pt"><o:p></o:p></SPAN></FONT> </P></DIV>
<P>
<HR>
_______________________________________________<BR>fot@autox.team.net<BR>=
<BR>http://www.fot-racing.com<BR><BR>Donate:=20
http://www.team.net/forums<BR>Unsubscribe/Manage:=20
http://autox.team.net/mailman/options/fot/riverside@southslope.net<BR><BR=
><BR>
<P>
<HR>
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<P align=3Dleft avgcert?? color=3D"#000000">No virus found in this=20
message.<BR>Checked by AVG - <A=20
href=3D"http://www.avg.com";>www.avg.com</A><BR>Version: 2015.0.6172 / =
Virus=20
Database: 4447/10838 - Release Date:=20
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http://www.fot-racing.com
Archive: http://www.team.net/archive
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